Re: [PATCH v3 0/4] LoongArch: KVM: Some small enhanments

[Huacai Chen]

Applied, thanks.

Huacai

On Mon, Mar 23, 2026 at 10:56 AM Bibo Mao <maobibo@xxxxxxxxxxx> wrote:
>
> There are some small enhancements about LoongArch KVM. There is
> improvement about VM entry path in patch 1 and patch, add pending
> request checking in advance and it is empty at most time.
>
> Also change vcpu_is_preempted() from function to macro method, by actual
> benchmark test such as unixbench. It is affected on physical machine
> with function method. With the macro method, only one nop instruction
> is added and there is no parameter parsing, there is no obvious
> performance influence with physical machine.
> ---
> v2 ... v3:
>   1. Add new patch to move host CSR_GSTAT save and restore in context
>      switch stage rather than VM entry, update it only when VMID is
>      changed on VM entry.
>
> v1 ... v2:
>   1. Add READ_ONCE() with src->preempted to avoid compiler optimization.
> ---
> Bibo Mao (4):
>   LoongArch: KVM: Add kvm_request_pending checking in
>     kvm_late_check_requests()
>   LoongArch: KVM: Move host CSR_EENTRY save and restore in context
>     switch
>   LoongArch: KVM: Move host CSR_GSTAT save and restore in context switch
>   LoongArch: KVM: Set vcpu_is_preempted() with macro rather than
>     function
>
>  arch/loongarch/include/asm/qspinlock.h | 27 +++++++++++++++++++++-----
>  arch/loongarch/kernel/paravirt.c       | 15 ++------------
>  arch/loongarch/kvm/main.c              |  8 ++++----
>  arch/loongarch/kvm/vcpu.c              | 26 +++++++++++++------------
>  4 files changed, 42 insertions(+), 34 deletions(-)
>
>
> base-commit: c369299895a591d96745d6492d4888259b004a9e
> --
> 2.39.3
>